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Cut-Through latency - is a type of timing measurement used for switches and other devices that operate using packet header information. The cut-through type measures the time interval between the first data bit out of the transmit port and the first data bit received by the receive port. The first data bit received on Ethernet links is the start of the MAC destination address field.
Store and forward latency - is a type of timing measurement used for routers and other devices that operate on the contents of the entire packet. The time interval between the last bit out of the transmit port and the first data bit received by the received port is measured. The last data bit out is usually the end of the FCS or CRC and the first data bit received is as described below for cut-through.
MEF frame Delay - is based on MEF 10.1 and RFC 3393 standards. They consist of the time interval starting when the first bit reaches the input port and ending when the last bit of the output frame is seen on the output port (first in, last out).
Forwarding Delay - is a last-in, last-out (LILO) measurement which is based on RFC 4689. The LILO method most closely simulates the way a network layer device actually processes an IP datagram. IP datagrams are not passed up and down the stack unless they are complete, and processing begins only once the last bit of the IP datagram has been received.
Delay Variation - The difference between the two consecutive frames in a flow with any lost packets being ignored.
Store and forward latency - is a type of timing measurement used for routers and other devices that operate on the contents of the entire packet. The time interval between the last bit out of the transmit port and the first data bit received by the received port is measured. The last data bit out is usually the end of the FCS or CRC and the first data bit received is as described below for cut-through.
MEF frame Delay - is based on MEF 10.1 and RFC 3393 standards. They consist of the time interval starting when the first bit reaches the input port and ending when the last bit of the output frame is seen on the output port (first in, last out).
Forwarding Delay - is a last-in, last-out (LILO) measurement which is based on RFC 4689. The LILO method most closely simulates the way a network layer device actually processes an IP datagram. IP datagrams are not passed up and down the stack unless they are complete, and processing begins only once the last bit of the IP datagram has been received.
Delay Variation - The difference between the two consecutive frames in a flow with any lost packets being ignored.
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